Great article here to read before you thru-hike after surveying former thru-hikers on things they regret about their journey. Biggest regrets are centered around not taking time to enjoy the journey. So relax, leave deadlines behind, and take it easy. The journey is the joy, the destination is nothing more than an end. Cheers!
http://appalachiantrailclarity.com/2016/04/02/regret-nothing-about-your-appalachian-trail-thru-hike/
http://appalachiantrailclarity.com/at-for-newbies/